So wait I forgot but why don’t you think Birdo could work as a Yoshi echo? I know she’s in the Mushroom Kingdom II stage but that’s her old sprite form just like how Dedede appears in the back of Dream Land I believe it is also as an old sprite (and Knuckles in Green Hill Zone) so she could theoretically still work as either a fighter or an assist trophy
Echoes so far have been from the same series. Birdo to my knowledge has never been in a Yoshi game so it doesn’t make sense. Yes, you can change some concepts but it just doesn’t make sense from the fact they really aren’t tied together beyond Double Dash.
















